Three-way cock



(M'odel.) M. CRIDGE.

THREE WAY COCK.

No. 246,467. Patented Aug. 30,1881.

WI TNESSESQ [NVE/V TOR A TTORNEKY.

UNTTED STATES PATENT OFFICE.

MATTHEW GRIDGE, OF BENNETT P. O., PENNSYLVANIA.

TH REE--WAYy COCK.

SPECIFICATION forming part of Letters Patent No. 246,467, dated AugustA30, 1881.

Application filed April 5, 1881. (Model.)

To all whom t may concern:

. Be it known that I, MATTHEW CEIDGE, of Bennett P. O., in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in Three-Tay Cocks; and I do hereby declare that thefollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,which form a part of this specification.

This invention relates to the construction of what are known asthree-way cocks7 or valves, and has especial reference to such inconnection with steam or air brakes on railway cars and engines. Thesecocks are usually made with conical plug-valves, and are a source of nolittle trouble, on account of the readiness with which they wear andbecome leaky, thus admitting steam unnecessarily to the cab, or allowingthe pressure of air or steam which should be transmitted to the pistonof the brake-cylinders to bc partialiy dissipated at the valve or cock.A stuffing-box has been added to the cock to prevent escape of uid intothe cab; but it does not prevent leakage around the plug from port toport. My object is to so construct the valve as to prevent such wear andleakage, or to so control it as to enable the engineer to take up thewear in a moment.

The invention consists in a disk-valve rotating upon a hat valve-seat,the two having the arrangement of ports hereinafter described; and itfurther consists in the combination therewith of a casing or shellprovided with a stuffin g-box, through which the valve-stem projects,and detachable stops for limiting the movement of the valve, all ashereinafter fully described and claimed.

In the drawings, Figure l is a side elevation ot my invention, partlysectional. Fig. 2 is a plan-section through Fig. 1. Fig. 3 is a sectionshowing the valve removed and exposing the ports in the seat. Fig. 4 isa view of bottom of valve.

A is a shell or casing having the tlat bottom or valve-seat B.

C is a nipple for attachment of the steampipe delivering from the boileror reservoir, and constitutes the inlet-port a, which opens into theshell A a little above `the level of the seat B. At the center ofvalve-seat B is the escape-port e, being simply an opening through thebottom ofthe casing A to the atmosphere. At a point near the oppositeside diametrically from the port a is the cylinderport b, cuttingvertically downward through the seat B and going out horizontally at thenipple D, to which would be coupled the pipe leading to thebrake-cylinder.

The valve E consists of a dat disk accurately fitting the face of theseat B and rotating thereon in a horizontal plane. A port, c, is cutvertically through the valve E, near its edge, corresponding in radiallocation with the cylinder-port b in the seat B. A radial groove, d, iscut on the face of the valve E, starting at the center, so as tocommunicate at all times with the escape-port e, extending toward thecircumference opposite the port c, and terminating at a point equal inradial location with the port c.

Valve E is provided with a stem, F, fitted to it by ball-and-socketjoint or its equivalent, which, however, is provided with key and seat,so that the valve will always turn With the stem. The valve E has castupon its upper surface the lugs or stops i i', and through the shell A,I insert the screw-pin le, the relations being such that when stop icomes against the pin k the valve is in one position and in the otherposition when stop t" is against pin k. By this construction the valvemay be removed after unscrewin g pin 7c.

The shell A is provided with a cap, H, having the stuffing-box I for thevalve-stem F.

The steam or air enters the port a, and always exerts its pressuredownward upon the top of Valve E, holding it firmly to its seat. In oneposition of the valve its port c is over the cylinder-port b, and steamor air passes to the brake-cylinder by way of the nipple D. In thediametrically-opposite position of the valve .E the coincidence ofport-s c and b no longer exists, and no steam can pass out of the shellA; but at this time the groove d is opening c and radial slot d,substantially as described.

2. The combination of shell A, valve E,ha.v 15 ing` lugs z' i', andscrew-plug k, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in l presence of two witnesses.

MATTHEV GRIDGE.

cylinder can now pass up through port b, groove d, and thence down andout through the escape-port e.

The stem F may have either a hand-wheel or lever-handle.

I claim as my invention- 1. The combination of shell A, having seat B,and provided with inlet-port a, opening into around over port b, so thatthe contents of the I shell A above the valve, outlet-port b, andVituesses: exhaust-port e, cap H, stuffing-box I, and stem JOI-IN M.PATTERSON, F, with rotary disk-valve E, having vertical T. J. MGTIGHE.

